There are a number of reasons that can be attributed to human causes. Anthropogenic pollution has led to climate change (note: this process would take ages to completely dry up a river). Rising temperatures decrease both the amount of snow melt and rainfall that help sustain some rivers. Some river’s flow from glaciers which are now receding. In addition to Global Warming, we humans build Dams to divert water from flowing its natural downhill journey and instead devote it to human consumption. If enough Dams are built, a river can dry up much earlier than it would naturally. Mining and a plethora of human development have the potential to interfere with the normal patterns of some of our great rivers.
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